If the formula $ r=\frac{1}{n-1} \sum_{i=1}^{n}\left(\frac{x_{j}-\bar{x}}{s_{x}}\right)\left(\frac{y_{j}-x y}{s_{y}}\right) $ were used to find the $ r $-value of the following data, what would be the value of $ \bar{x} $ ?
\begin{tabular}{|l|l|}
\hline$ x $ & $ y $ \
\hline 10 & 10 \
\hline 11 & 12 \
\hline 12 & 16 \
\hline 13 & 17 \
\hline 14 & 18 \
\hline
\end{tabular}
A. 14
B. 10
C. 12
D. 16

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